The Mastercool 82375 Standard Oil Injector offers users an excellent method for adding refrigerant oil or large amounts of UV leak detection dye to an A/C system. Users can add oil by allowing a vacuum to pull it in after the evacuation process, or use refrigerant to push it in by using the recharge system. The standard model uses a needle-style valve attached between the manifold gauge set or charging equipment and A/C hose. The 82375 model features a rugged, all-metal 2 oz. canister design.